What does DRF stand for in GD&T?

What does DRF stand for in GD&T?

• A. Datum Radius Frame
• B. Dynamic Reference Frame
• C. Datum Reference Factor
• D. Datum Reference Frame

Answer: (D)

In GD&T, DRF means Datum Reference Frame—the coordinate system created by the datum features (primary, secondary, and tertiary) that is used to locate and orient all tolerances on the part. This frame defines origin and axes so that every feature control frame’s tolerance is interpreted consistently relative to that frame. The other terms aren’t standard GD&T terminology: a Datum Radius Frame isn’t a recognized concept, a Datum Reference Factor isn’t used in GD&T, and while Dynamic Reference Frame can appear in some metrology contexts, the GD&T practice uses Datum Reference Frame to describe the reference frame established by the datums.

In GD&T, DRF means Datum Reference Frame—the coordinate system created by the datum features (primary, secondary, and tertiary) that is used to locate and orient all tolerances on the part. This frame defines origin and axes so that every feature control frame’s tolerance is interpreted consistently relative to that frame.

The other terms aren’t standard GD&T terminology: a Datum Radius Frame isn’t a recognized concept, a Datum Reference Factor isn’t used in GD&T, and while Dynamic Reference Frame can appear in some metrology contexts, the GD&T practice uses Datum Reference Frame to describe the reference frame established by the datums.